Improvement in moulds for vulcanizing rubber pencil-tips



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JOSEPH BANIGAN AND GEORGE W. MILLER, OF SMITHFIELD, RHODE ISLAND.

Letters Patent No. 99,045, dated January 18, 170.

IMPROVEMENT IN MOULDS FOR VULCANIZING- YIR'UBBE PENCIL-TIPS.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom 'it may concern Be it known that we, JOSEPH BANIGAN and GEORGE W. MILLER, both ofSmithtield, in the county of Providence, and in the State of Rhode Island, have invented a new and useful improved Mould for Vulcanizing Rubber Pencil-Tips; and we. do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the annexed drawings, making part of this specification, in which.-

Figure l is a plan View, one-half of the puncherplate being broken away, Ato show the matrix-plate.

Figure 2 is a vertical section, showing one-half of the matrix-plate, a short distance removed from the puncher-plate, in order to permit the punchers to be pushed through the latter, to facilitate the removal of the finished tips.

The same letters are used, in both figures, to designate identical parts.

This invention relates to a mould for making penciltips; and

Our improvement consists in employing, in connection with a matrix-plate and a punisher-plate, a series of punchers, or plungers, reciprocating in the puncherplate, and so arranged therein, that on the completion of the tips, and the removal of the matrix-plate, said punchers can be made to push the finisher1 tips out ofthe puncher-plate, after which, they can be readily slipped oif the ends of the punchers.

'lo enable those skilled in the art to make and use our invention, we will proceed to describe its construction and operation.

In the drawings- A represents the matrix-plate, made of any suitable material, and of convenient size and form. In its upper surface, a series of matrices, a a, is formed, the shape or design of which may be largely varied, to suit the taste of the manufacturer. In these matrices, the head of the tip is pressed.

B represents the puncher-plate, in outline like the matrix-plate, but being greatly thicker. Its under surface is to be made to fit neatly upon the upper surface ofthe matrix-plate; and upon its upper surface it has a ridge or tiange, Bl, of uniform height, and extending entirely around its sides. The height of this ridge is a little more than that of the cylindrical portion of the tips to be formed.

B2 B2 are a series of vertical holes, formed in the puncher-plate, equal in number to that of the inatrices in the matrix-plate, and so arranged that such holes are, respectively, centrally above the respective matrices. These holes are of a uniform diameter from the uppersurface ofthe puncher-plate to a pointmarked l, where they are abrupt-ly contracted to the size of the reduced portion of the punchers. This contraction is continued a short distance, to the point b', where the hole is again enlarged to such size as it is intended to give to the cylindrical end of the tips, such ends being formed in this part of said holes.

C C represent the punchers or plungers, formed as clearly shown in fig. 2, their enlarged portion being made to fit neatly in the upper portion of the holes Bf. They are all made of a uniform length, which is to be such, that when their upper ends are `flush with the uppersurface of the flange B1, their lower ends have penetrated through the puncher-plate and entered the matrices, yet not touching the bottom of the latter; and the length of the reduced portion is to be such, at least, as to permit them t0 be pushed through the puneher-plate a suicient distance to Withdraw the iinished tips therefrom.

D represents the rubber tips.

This device may be operated .in the following manner:

The punchers having been withdrawn from their plate, the mould is turned upside down, and the matrix-plate removed, the two plates being held together' by dowel-pins, or in other convenient manner; after which', a sutlicient quantity of raw rubber, in its plas- `tic state, is inserted in the lower enlarged portion of each hole B2, entirely filling such portion.

The matrix-plate is then again placed upon the punoher-plate, and the entire mould turned up; after which, the punchers are introduced, and the device placed in a suitable press, which is to press the punchers down to alevel with the flange B. It being taken out of the press, the matrix-plate is removed, when the punchers can be pushed through their plate, to

withdraw the iinished tips, which can then be readily removed fromrthe plungers, without danger of defacing them, and afterward properly vulcanized.

Having thus described our invention, What we claim, and desire to secure by Letters Patent, is-

1. In combination with a mould for forming penciltips, reciprocating punchers or plungers, `so arranged as to first form the tips, and then withdraw them from thel mould, substantially as and for the purpose set fort-h.

2. The combination of the puncher-plate, matrixplate, and reciprocating punchers, constructed and arranged, with reference to one another, substantially as and for the purpose set forth.A

The above specification signed by us, this 28th day of December, A. I). 1869.

JOSEPH BANIGAN. GEORGE W. MILLER. Witnesses z EDWrN ALDRIGH, LELAND D. J nNCKns. 

